Hi, thanks for the super fast fix. Could it be backported to 4.8? git
cherry-pick gives a conflict in aarch64.md which is probably easy to fix
if you know how this code works:
(define_insn "*compare_neg<mode>"
<<<<<<< HEAD
[(set (reg:CC CC_REGNUM)
(compare:CC
(match_operand:GPI 0 "register_operand" "r")
(neg:GPI (match_operand:GPI 1 "register_operand" "r"))))]
||||||| parent of 46b590a... PR target/9744
[(set (reg:CC_SWP CC_REGNUM)
(compare:CC_SWP
(neg:GPI (match_operand:GPI 0 "register_operand" "r"))
(match_operand:GPI 1 "register_operand" "r")))]
=======
[(set (reg:CC_Z CC_REGNUM)
(compare:CC_Z
(neg:GPI (match_operand:GPI 0 "register_operand" "r"))
(match_operand:GPI 1 "register_operand" "r")))]
>>>>>>> 46b590a... PR target/9744
""
"cmn\\t%<w>0, %<w>1"
[(set_attr "v8type" "alus")
(set_attr "mode" "<MODE>")]
)
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https://bugs.launchpad.net/bugs/1267761
Title:
miscompilation of unsigned comparison on aarch64
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